Naomi Osaka will make her playing entry to the Olympic Games a day later than expected after her first-round tennis match was put back to Sunday.

Japan's big hope for gold will play China's Zheng Saisai in her opener at the Ariake Tennis Park.

The match was billed to be first on the centre court at 11:00 local time on Saturday, only for Games organisers to announce it has been moved back by a day.

The move came amid mounting expectation that Osaka would have a prominent role to play in Friday's opening ceremony, meaning she would have little time to rest between taking part in that event and playing Zheng.

Osaka abandoned her French Open campaign after one match, having been warned she risked expulsion for refusing to take part in news conferences during the tournament.

The reigning US Open and Australian Open champion, who has spoken of struggling with anxiety and depression, then elected to skip Wimbledon.

The quarantine experience has become routine for those travelling the world to play or watch sport during the coronavirus crisis.

It has been that way in Japan for the Tokyo Olympics. Depending on which country you arrive from, there may be a period of isolation to tolerate before being allowed to participate in the Games.

This has been the case for Stats Perform's journalist on the ground, Peter Hanson, who is approaching the end of a three-day quarantine at his hotel in order to comply with the rules for UK residents working in a media capacity in the Japanese capital.

Here, he provides five tips on how to survive quarantine…

Tip 1: Binge on Netflix

Admittedly this isn't a particularly novel idea but when you're pretty much confined to a hotel room for three days what better way to pass the time than with some easy watching?

It doesn't have to be Netflix…there are plenty of other streaming services available of course. But, right now I'm powering through the US version of The Office (even if that makes me feel a little traitorous towards the original UK edition, which – sorry folks – remains the significantly better show).

Tip 2: Reading

It's good to come prepared. Having undertaken a 12-and-a-half-hour flight to get to Tokyo before the three days of isolation even began, having a good book (or even a bad one really) just made good sense.

I'm a big fan of Harlan Coben's work, so with me in Tokyo is his thriller 'The Boy in the Woods', and also a book about the world's greatest football team…Sheffield Wednesday, penned by Sheffield Star journalist Alex Miller.

Tip 3: Bring out the bangers…

Admittedly this tip comes on the back of a bit of a head loss…but when in the moment, you have to fully embrace it folks!

Crack on with your Spotify, your Apple Music, or wherever you get your tunes from and let the music take control! Friday's morning get-up song for me belonged to Ronan Keating because, well, life is a rollercoaster right now…

Tip 4: Sick tricks!

This one is inspired by one of my best friends back home, who will often yell "sick tricks!" before doing something pretty juvenile or a very basic skill with the confidence and gusto of a trapeze artist… and it gets a laugh from me pretty much every time.

Luckily, just before I left my house in Sheffield I spotted a tennis ball to take with me and – recalling the feats of skills posted by several ATP and WTA stars online during their own Australian Open quarantines – decided to have a go at some of my own tennis-ball tricks…it did not go particularly well.

Tip 5: Work, work, work...

No, not the Rihanna song... although playing that on repeat would absolutely be a great way to spend your time in quarantine.

What I'm alluding to is the fact that at some point during a three-day quarantine, some work will have to be done.

Only, in this case I got distracted by my Football Manager save and decided that was also a pretty decent way to kill some time…

Joe Ingles is coming off the sort of disappointment with the Utah Jazz that perhaps only an Olympic medal could soothe.

Ingles, runner-up for the NBA's Sixth Man Award in the 2020-21 season, could not prevent the top-seeded Jazz losing to the Los Angeles Clippers in the second round of the playoffs.

He scored 19 points in three successive games against the Clippers but twice in a losing cause, meaning a season that he packed with career-bests ended on a painful note.

Ingles is now chasing gold with Australia at Tokyo 2020, with an opening game against Nigeria scheduled for Sunday.

Australia have never won an Olympic medal in men's basketball, finishing fourth on four occasions, most recently at Rio 2016. 

They were also fourth at the 2019 FIBA World Cup, but Ingles says the time has come to get hold of a medal.

Gold is the obvious target, and when Ingles was asked whether silver or bronze would be a disappointment, his verdict was that anything but top step on the podium would feel like a letdown, at least initially.

"In the moment, yeah; in the long run, no," he said. "We don't talk about anything else – there's one goal in mind and that's to win a gold medal in Tokyo.

"If we wait and look 10 years down the track we'll think different but we're here to make history."

Australia's women have fared better on the big stage, winning three Olympic silvers and two bronze medals.

Ingles had an NBA career-best 34 points against the Washington Wizards in March, while in January he passed John Stockton to set a new Jazz record for the most three-pointers in a career with the franchise. Stockton made 845 and Ingles is now on 993.

He set career highs in field-goal percentage (48.9 per cent), three-point success rate (45.1 per cent) and free-throw hit rate (84.4 per cent) in the regular season, along with a points-per-game average of 12.1 that matched his 2018-19 best.

Now the 33-year-old small forward heads into his fourth Olympics seeking that elusive medal, and a familiar face in Brian Goorjian is leading the team.

Coach Goorjian was in charge of Australia when Ingles made his Games debut in 2008 at Beijing, and he returned to the role in November of last year.

"He's a lot older. We're both a lot older," Ingles said. "So awesome to have him back.

"I was interested to see if there would be any differences in him. He moves a bit slower and his fingers are a bit more busted up but he's the same coach."

Germany's female gymnasts are preparing to compete at the Tokyo Olympics with a strikingly different look after packing unitards alongside leotards in their kit bags.

The unitard has characteristics of the traditional leotard but comes with attached leggings that run down to the ankles, being designed for comfort.

It was described by the German Gymnastics Federation (DTB) in April as being a move "against sexualisation in gymnastics".

The DTB said the kit's purpose was "to present aesthetically – without feeling uncomfortable", and after a positive pilot at the European Championships in Basle, an Olympic Games version of the kit has been launched for Team Deutschland's competitors.

Elisabeth Seitz, set to compete in her third Olympics, said: "It's about what feels comfortable. We wanted to show that every woman, everybody, should decide what to wear.

"Most people were positive about it. But after the European Championships the time was way too short for others to design a unitard. Maybe in the future. We really hope so."

It is not a given that Germany will wear the unitard for competition at the Ariake Gymnastics Centre, but that is an option. The team will vote on whether to don the leotard or unitard ahead of Sunday's qualification event.

"We decided this is the most comfortable leotard for today. That doesn't mean we don't want to wear the normal leotard any more," Seitz said. "It is a decision day by day, based on how we feel and what we want. On competition day, we will decide what to wear."

The Germany team's move comes at a time when there is scrutiny on the demands put on female sports stars when it comes to their attire.

Norway's beach handball team were fined as their shorts were ruled to be too long, while British Paralympic long-jumper Olivia Breen was told by an official her briefs were too short.

The German gymnasts have found support for their mission, with Games newcomer Sarah Voss saying: "We girls had a big influence on this. The coaches were also very much into it.

"They said they want us to feel the most confident and comfortable in any case. It just makes you feel better and more comfortable."

Dina Asher-Smith says her "heart does go out" to banned sprint rival Sha'Carri Richardson but is convinced there will be several battles to be had in the coming years.

Richardson, 21, was primed to be one of the favourites for gold at Tokyo 2020 after winning the 100 metres at the U.S. Olympic Track and Field Trials in Eugene, Oregon, with a time of 10.86 seconds.

However, it was revealed Richardson had tested positive for cannabis following that event last month and a consequent one-month ban – starting on June 28 – meant she was ineligible to register for the Olympics, which start on Friday.

Richardson told NBC that her biological mother had died prior to the trials, where she was pictured sharing a warm embrace with her grandmother, who helped raise her.

Asher-Smith, going for gold in the 100 and 200m for Great Britain, has sympathy for the circumstances that led to Richardson's exclusion from the Games.

Speaking to a round-table of journalists at a pre-Games TeamGB call, she said: "I feel sorry for her, her mother passed away, you know? 

"I was kind of thinking about that. Lots of you know my mum, personally I even said to my mum 'if you passed away I wouldn't have done the trials' I have to admit. 

"That's not a criticism, it's just emotionally that's a lot. My mum said 'don't be silly I'd always want you to do it' – it's definitely not a criticism but that's kind of just [how I would be] dealing with that situation. 

"Lots of stuff happened but I'm in absolutely no position to tell someone how to grieve, no one is, that's the first thing that comes to mind she was grieving. 

"If that was my mum…obviously rules are rules but the girl was grieving so your heart does out to her in that whole situation because no one ever wants to lose a parent, so yeah it's awful."

Richardson is the second fastest woman over 100m in the world this season having posted a 10.72s in April. Only Jamaican veteran Shelly-Ann Fraser-Pryce has gone quicker, with a best of 10.63s.

Asher-Smith, the reigning world champion over 200m, has yet to lose a race in 2021 and she is sure there will be plenty of time to face off with Richardson down the line.

"We've both hopefully got very long careers you know?" she said. 

"It's not just about one person as well, you've got so many talented women that can run incredibly fast, it's one of those things I'm like don't worry about it there's so many more chances."

Asher-Smith is regarded as one of Britain's best medal hopes on the track in Tokyo and was described by World Athletics president and two-time Olympic champion Seb Coe as the "poster child" for Tokyo.

While grateful for such compliments, the steely focused 25-year-old is shutting out the external noise as she bids for glory in the Japanese capital.

"I didn't know he'd said that, it's very kind," she said.

"To me, I don't think about those things to be honest. I don't think about things around me, what people are talking about, what the headlines are I just don't think about that.

"I've always been like that because at the end of the day it's me and the track, me and the club, and all this stuff that's going around is literally just noise. 

"The only thing that can affect my performance is the mental state I'm in and physical state I'm in. 

"I try and make sure that is as strong and as good as possible. So, when people talk about all this stuff, postergirl or whatever, cool, I don't know to be honest, I don't pay attention to the noise, the chatter, what the opinions are."

An extremely relaxed Asher-Smith says she has no fear ahead of the Games as she has been preparing her entire career for these moments.

She added: "What's scary about it? I get this question all the time, when I was checking into Heathrow all the BA [British Airways] people were like are you nervous? And I was like 'No what is there to be nervous about?'

"Obviously, this is a very different scale, but I line up and race and I've done that since I was eight years old and I'm very good at it. Obviously, the stakes change, the mechanics change, the precision of it changes but fundamentally this is something I do week in, week out. 

"I love a show, I love a stage, and putting together a performance when it really matters when the lights are on. 

"I love championships, my coach always tell me to quell my excitement through the season until championships and then let it loose. He told me yesterday I can get excited so you can see more energy from me now."

Team GB sprint star Dina Asher-Smith hailed Marcus Rashford and his England team-mates for "showing a really good sense of moral leadership for our nation".

Manchester United striker Rashford earned plaudits for his work lobbying the government to provide free school meals during the height of the coronavirus pandemic last year, while he and the rest of the Three Lions squad who reached the final of Euro 2020 this month were also vocal in the fight against racism, continuing to take a knee throughout the tournament in a united showing against racial prejudice.

Asher-Smith, who will be going for gold in the 100 and 200 metres at the Tokyo 2020 Olympics, has herself spoken out about her experiences of racism and in March she received the column of the year award by the International Sport Press Association for an article she wrote in the aftermath of George Floyd's murder.

She has also been a vocal supporter of the protests taken by Naomi Osaka and Lewis Hamilton in the past and the 25-year-old, a die-hard Red Devils supporter, hopes to do more in the area of social activism once the Olympics have finished.

"I think what Marcus and all the other players have been doing is fantastic and it made me so proud to watch them and see how they conducted themselves," Asher-Smith told a roundtable of journalists at a pre-Games Team GB call.

"I think they've done fantastically throughout the Euros. I think they surpassed all our expectations in the nicest way.

"They are actually a credit to our nation and showing a really good sense of moral leadership for our nation and I think as sports people we are really proud and definitely as a Brit, and a black Brit, especially throughout the Euros I was really proud of them. I think they represented both the nation and our community incredibly well.

"Social activism is something I'd love to increase, but with the Olympics and everything I've been one-track minded towards Tokyo. But definitely once we're past this point, because I definitely compartmentalise things, when I'm over this little compartment of my life that's definitely something I want to increase because you do have to give back.

"I think it's an essential part of being not only an athlete but someone who has had an opportunity and the only reason I'm here today is because of the good will and hard work of so many other people in teams and throughout my community and so many opportunities I've had, whether that's grants or school teachers taking extra time to take me to a club or telling me about a club.

"It's goodwill of other people so it would be entirely selfish to not give back when you have the opportunity to in your career and I'm really proud of how the footballers have done that throughout the year and how they conducted themselves throughout the Euros." 

Athletes competing in Tokyo are set to have more scope to protest at the upcoming Olympics after the IOC relaxed its controversial Rule 50, which previously forbade any "demonstration or political, religious or racial propaganda in any Olympic sites, venues or other areas".

The IOC will allow athletes to make protests prior to competitions starting, though anyone doing so on podiums or medal ceremonies – similar to the famous Black Power salute made by Tommie Smith and John Carlos at the 1968 Mexico City Olympics – could face sanctions.

Asher-Smith always expected a climb down, adding: "I think to see the IOC lifted the ban, I was entirely unsurprised. 

"Protesting I see as a fundamental human right, so if you were to penalise someone for standing up against racial inequality how on earth would that go? You know what I mean? How on earth would you enforce that? 

"Would you revoke somebody's medal for saying racism is wrong? I honestly thought that was always going to happen otherwise they would have just been faced with loads of athlete protests at the Games and it would have been really embarrassing, you can't really tell people not to.

"Unless they want to say they're against people saying they're against racism I didn't know how that was going to go.

"Some of the Olympics' most iconic moments have been the Black Power salute by Tommie Smith way back when, and that is something people remember the Olympics for, that's something they're very proud to see at the Olympic Games."

Asher-Smith, the reigning 200m world champion, also hopes she can play her part in inspiring young women to take part in sports over the course of the next two weeks.

"I think the next fortnight has great potential to inspire an entire generation of young women as we do with every Olympics," she said.

"But I think it's becoming increasingly important nowadays. We have significant drop-off rates of young women.

"They hit teenage years, they're all very active in the sporting field or active world, then they hit between 11 and 15 and drop out in their droves.

"Then it's under 10 per cent get enough exercise or get the government recommended guidelines of exercise and engage on aesthetic grounds rather than having fun. 

"I hope the next fortnight shows not only can you make a viable career out of this. Being a sportswoman in whatever you want to do is a viable career it's not just track and field, it's not just tennis, it's not just football there are many avenues you can go down to be a career sportswoman. 

"But also that it's fun, that it can completely change your life, develop lifelong friendships, it's not just about doing sport for a physical goal to lose weight, to gain this, to alter your body but also for self-esteem, your mind, your mental health and to live a fulfilled and enriched life. 

"I think the Olympic Games has an incredible chance to inspire so many women and also women who have had babies, and the Paralympics as well, women who have very different life circumstances to all of us, so I think it's a great platform and showcase for all the sports we love."

Defending double Olympic champion Andy Murray revealed how his daughter provided him with inspiration after his early exit at Wimbledon.

A heavy third-round defeat by Denis Shapovalov had left the Scot questioning whether his hard work in training was worth it after years of injury woe as he tried to regain his spot at tennis' top table.

The two-time Wimbledon winner, who has four young children, now feels prepared and revitalised to compete in his fourth Games off the back of his young daughter's accidental wisdom.

Murray told reporters: "When I got home, the day after my match, my daughter said to me: 'Daddy, you're home because you lost another tennis match?'

"I said: 'Yeah, I did. But what do you do when you lose at something?' And she said: 'You try and try again?' I was like: 'Yeah, that's what I want to do.'

"I want to keep playing because I enjoy it and I still think I can play at a good level. 

"There have been difficult moments obviously in the last few months and the last year with the injuries and stuff, but right now this is the healthiest I've been for the longest period in the last year."

Murray will be part of a six-man squad in Japan, including doubles partner and two-time grand slam doubles winner Joe Salisbury, as he looks to defend his Rio 2016 and London 2012 golds.

As the only player to win back-to-back singles titles in Olympic history, Murray still intends to compete at the top-level of tennis for as long as he is able to do so.

"It can be hard and after tough losses like that at Wimbledon - you question a lot of things," the Team GB athlete added to BBC Sport.

"I do still feel like I am capable of playing high-level tennis and when that isn't the case I will stop playing. But right now I don't believe that is the case."

Yet the Games in Japan provides a completely different challenge in 2021 as all athletes remain acutely aware of the coronavirus concerns that surround sport all over the world.

The 34-year-old's Team GB team-mate Johanna Konta is one of many players to miss out due to circumstances linked to the virus.

Murray, who was drawn against ninth seed and Wimbledon quarter-finalist Felix Auger-Aliassime on Thursday, is familiar with the devastating impact a positive result can have after having to miss a major due to COVID-19.

"It happened to me before the Australian Open and I was gutted," he said.

"Thankfully I was able to compete in another grand slam a few months later, but if you've been preparing for something for five years and something like that to happens to you, it would be brutal.

"So there is an anxiousness, but from what I've seen everyone is taking the protocols seriously, so hopefully there won't be too many issues."

Murray will be hoping for few issues on the court too, though he and Salisbury have been drawn in a difficult tie against second-seeded pair Pierre Hugues-Herbert and Nicolas Mahut.

Novak Djokovic has been burned by high expectations at the Olympics before, so it was little surprise that he should express only guarded optimism on the eve of the Tokyo Games.

The Serbian, who has won the Australian Open, French Open and Wimbledon already in 2021, is chasing the gold medal that would leave him one step away from the first tennis calendar 'Golden Slam' by a man.

Should he triumph in Japan over the next fortnight, Djokovic will head to the US Open in late August needing to win in New York to complete the full set.

Steffi Graf, who in 1988 won all the slams and gold at the Seoul Olympics, is the only player in tennis history to have completed such a sensational season.

Djokovic said such a feat was becoming a "more and more realistic" target, as he spoke in a Serbia team news conference, but the last time he stepped off the singles court at an Olympic Games, he was in tears, having lost in the first round at Rio to Juan Martin del Potro.

There is no danger of Djokovic running into his Olympic nemesis in Tokyo, with Del Potro, who also beat Djokovic in a bronze-medal match at the London 2012 Olympics, not a part of Argentina's squad as he battles back from four knee operations.

Looking at his own prospects for Tokyo and the rest of the year, Djokovic said: "It is still a long way to go ... I put myself in a very good position. But I will take things very slowly and cautiously.

"It's an approach I need to have because in the past I wasn't probably fully experienced in that approach. And I started to feel there were a lot of distractions around that influenced my performance.

"I know there are a lot of things on the line, a lot of history on the line. I'm privileged to be in this position. I worked very hard to be here, with my team, of course. But let's talk about history if everything goes great."

After his singles loss in Rio, Djokovic and Nenad Zimonjic lost in the second round of doubles to Brazilians Bruno Soares and Marcelo Melo.

A bronze from Beijing 2008 is all Djokovic has to show for his Olympics career to date, but he is a hot favourite for the title in Tokyo, where he will start against Bolivia's world number 139 Hugo Dellien.

The 34-year-old Djokovic said he "would be delighted to ask" Graf how she achieved her 1988 clean sweep.

"When I was thinking about her ultimate achievement ... I did not think it... I don't want to say 'achievable', but [I thought] there was a slim chance that someone could make it again, both male and female," Djokovic said.

"But right now it seems more and more realistic. Of course, it is one of my goals and dreams."

Djokovic has neither Roger Federer nor Rafael Nadal as rivals in Tokyo, with Federer missing after reporting a knee injury setback and Nadal electing to give the event a miss.

The 'Big Three' each have 20 grand slam titles now, following Djokovic's hot streak, and the Serbian admits it is unusual for both superstars to be absent.

"I have not experienced too many big tournaments in the past 15 years without Roger and Rafa playing. So it's a little bit strange," Djokovic said. "I'm used to seeing at least one of them. But still, some of the best players in the world are here.

"The guys who are in the top six, seven in the world, they are the biggest competitors or candidates for winning a medal. But potentially I am meeting with them in the later rounds."

After winning Wimbledon for a sixth time, Djokovic surprised many by claiming he could skip the Olympics, but he was reeled in by the appeal of representing his country, perhaps for the final time in the Games.

"Without the key element of any sports events – the crowds, the fans, that energy – it's different, but it is still the Olympic Games," he said.

"I was in a dilemma for a little bit, but I decided to come, and I'm glad because there are many more things that are beautiful about the Olympic Games. So I will try to focus on those things."

Andy Murray feels claiming an Olympic medal at Tokyo 2020 would be the greatest achievement of his illustrious tennis career.

Set to take part in his fourth Games as he looks to defend the singles title he won at London 2012 and successfully retained at Rio 2016, Murray knows this tournament is likely to be his last at the Olympics.

A creditable and entertaining run to the third round of Wimbledon came amid questions over his long-term future in the game after several years of injury woe.

After losing to Denis Shapovalov at the All England Club, Murray has been drawn to play against another Canadian, Felix Auger-Aliassime, in Tokyo.

He will also play in the men’s doubles alongside Joe Salisbury, with a tough draw in that competition too against Pierre-Hugues Herbert and Nicolas Mahut.

Despite having three grand slam wins, two Olympic titles and a doubles silver medal to his name, Murray believes a podium place in Japan – which he feels is possible – would be a crowning achievement after all he has been through. 

"That is the goal, to try and win another medal," Murray told reporters. "I'm aware that it is not going to be easy. 

"I'm also in a slightly different position to what I was four, five years ago when I would’ve been expected to get one. 

"Maybe that is not the case this time around, but for me, it would probably be my best achievement if I could do that after everything that’s gone on the last few years. 

"I'm motivated for that reason alone and I still believe that I can do that. I still believe that it is possible."

Now 34, it is by no means certain Murray will still be playing and competitive on the ATP Tour by the time the 2024 Olympics take place in Paris.

"I know that this could be the last [Olympics] for me," added the Briton.

"So I want to go out there and leave everything out on the court, fight for every single point because ultimately that’s all you can do."

Having beaten Roger Federer and Juan Martin del Potro in his two Olympic finals, Murray – who revealed he has practiced well and regularly since Wimbledon - hopes his experience of going all the way at the Games will work in his favour.

He added to BBC Sport: "I've prepared as best as I can. I have tough draws in singles and doubles but I think I have a chance.

"If I can get through a round or two I'll start to feel more comfortable. I also have the experience of playing in the Olympics, which I can use to my advantage."

Having taken a five-month break in January, Tom Dumoulin cannot wait to get back into cycling action for the Netherlands as he lines up as one of the favourites in Tokyo.

Dumoulin took an indefinite break from cycling at the start of 2021 to understand his motivations for the sport, but the three-time Tour de France stage winner returned in June and will represent his country at the Games.

Usually a time-trial specialist, Dumoulin will compete in the combined road race and time trial as he looks to become only the second cyclist to win both events at a single Games.

The only cyclist to achieve this feat before is Dumoulin's compatriot Leontien Zijlaard-Van Moorsel, who won both events at the Olympic Games Sydney 2000.

"I'm glad to be back. I had a couple of good weeks in June and the condition improved gradually. The most important thing is that I had fun on the bike again, and I took pleasure in working towards a goal again," the 2017 Giro d'Italia general classification winner said.

"I really want to go for it in the road race. It's a super-beautiful course and the heat normally suits me. I mainly prepared for the time trial, because that's my main goal, but that full gas on Saturday does not have to affect my [performance in the] time trial on Wednesday."

The Netherlands and Italy have won a joint-record nine cycling gold medals at the Games and Dumoulin believes he and his team-mates have another good chance of success on Saturday.

"We have Bauke Mollema as target man and that's logic. We have got a strong team, but not really a team to control the race.

"Dylan Van Baarle, Wilco Kelderman and me, we have free roles and the three of us hope to go a long way, but we will support Bauke wherever necessary.

"Yoeri Havik who combines the road race with track cycling [at Tokyo 2020], joins us to support the team in the first 100 kilometres."

Graham Arnold revealed he had "visualised" Australia's impressive 2-0 win over Argentina in their Olympics opener – and said keeping Lionel Messi and Diego Maradona out of conversations was all-important.

Australia head coach Arnold saw his Olyroos team strike a major victory for the underdog with their Tokyo 2020 success in Sapporo, where goals from Lachlan Wales and Marco Tilio did the damage.

Although the Argentina team this year does not carry the same star quality as the 2004 and 2008 sides that featured Carlos Tevez and Lionel Messi respectively, the South Americans were expected to be on a high after their senior side lifted the Copa America trophy earlier this month.

Arnold's Australian troops were highly impressive in the Group C tussle, however, even though their coach still saw room for improvement.

"Nobody would have given us a chance apart from us. I've been visualising this performance for the last couple of weeks, I even visualised the score," Graham said.

"I believe in these boys and I believe so much in them that I'm not happy with our overall performance. I was happy with the work rate, the energy, but at times we turned over the ball too simply and too easily. We need to improve as we go on, and we will."

Arnold pointed to Australia having only one previous Olympic men's football win in the 2000s, a 5-1 win over Serbia and Montenegro in 2004 at the Athens Games.

"It's a great win, but we've done nothing yet. It's three points, we're off to a great start, the first win, but the important thing is improvement," the coach added.

"We didn't mention the name of the opposition, it's all about us. Sometimes when you mention a nation like Argentina's name, everyone just starts thinking of the players, Diego Maradona, Lionel Messi, and Copa America champions.

"It was more about focusing on ourselves for the last week and making sure all the players knew their roles, their jobs and building a lot of belief in the players that we could go out there and put in a good performance and win the game."

He vowed Australia were "here to compete for a gold medal" and offered up the victory to those locked down in Australia during the ongoing COVID-19 crisis.

"It was probably the last thing I mentioned to the players before they went on the pitch," he said. "Australia, New South Wales in particular, is going through a very tough time at the moment with COVID, with lockdown and I just said to the boys, 'A lot of families are locked down at home, let's put a smile on a lot of Australian faces tonight, give them a performance they will remember'.

"I really expect that a lot of people back at home who didn't give us much chance of winning before really enjoyed that. I expect we put a lot of smiles on a lot of faces ... for tonight anyway."

Michael Phelps hailed Katie Ledecky as "the best female swimmer that we have ever seen" as the American looks to add to her haul of five Olympic golds in Tokyo.

Ledecky won the gold medal in the 800m freestyle race at London 2012 at the age of 15 and went on to scoop four golds in the Rio Games five years ago.

The 24-year-old will be aiming to defend her titles in the 200m, 400m and 800m individual freestyle races, as well as the 4x200m freestyle relay.

A new event has also been added in for the women at this year's Games, with the 1500m freestyle up for grabs.

Given her achievements so far, Ledecky may well have Phelps' all-time Olympic record of 23 gold medals in her sights.

Phelps, who also holds the record for the most gold medals in individual events (13) and Olympic medals in individual events (16), believes Ledecky already has to be considered one of the greats.

"Katie and I have known each other for a long time," the 36-year-old said in a Panasonic Instagram live interview. "She is hands down the best female swimmer that we've ever seen.

"I always say one thing for her is just be her. As long as she's being herself and preparing for what she has to do, everything else will happen how it's supposed to.

"She's somebody that understands what to do in this setting and she's going to go out there and have some fun and we're going to see a lot of fast times."

Phelps also suggested Ledecky, and other athletes competing for the top prizes in Tokyo, must go into "autopilot" in order to keep their composure when it counts.

He added: "You've done the hard work, now it's just time to let it all show.

"Go out there, have some smiles, have some laughs and perform.

"From [Athens] 2004 on, I feel I was almost on autopilot because the preparation was done. All I had to do was just get on the blocks and race."

Richarlison fired a first-half hat-trick before nervy Brazil almost squandered a 3-0 lead against Germany in their Tokyo 2020 opener, while Australia stunned Argentina.

Reigning Olympic champions Brazil eventually toppled Germany 4-2 in the Group D opener in Yokohama, a rematch of the final from the 2016 Games in Rio that went to a penalty shoot-out.

Brazil were pegged back to 3-2 on this occasion before Paulinho's stoppage-time strike ended 10-man Germany's hopes of snatching a draw.

Richarlison made a seventh-minute breakthrough when Germany defender Amos Pieper slipped to allow the Everton striker a clear run on goal. Although his first shot was pushed out by Florian Mueller, Richarlison lashed in the rebound on the half-volley.

A close-range header after 22 minutes made it 2-0 and Richarlison sealed his treble with a shot into the right corner that took a slight deflection off Pieper.

Matheus Cunha missed a penalty for Brazil in first-half stoppage time before clumsy goalkeeping from Santos allowed Germany to get on the scoresheet after the break, Nadiem Amiri's tame volley creeping in.

Germany's Maximilian Arnold was dismissed after a soft second booking for a clash with Dani Alves, but another goal arrived when Ragnar Ache headed home in the 83rd minute, only for Paulinho's clinical breakaway finish, high into the top right corner, to make sure of the points.

Australia enjoyed a banner day as goals from Lachlan Wales and Marco Tilio floored a youthful Argentina side, who had midfielder Francisco Ortega sent off shortly before half-time.

Wales tucked in a low cross from Joel King to give the Olyroos a 14th-minute lead, and Ortega was dismissed for two bookable offences in quick succession to leave Argentina in trouble.

Tilio sealed a 2-0 win with a thumping left-footed strike into the right corner from 20 yards after 80 minutes as Argentina were caught on the break.

France were beaten 4-1 by Mexico, with substitutes Uriel Antuna and Eduardo Aguirre putting the finishing touches to the impressive win with late goals. Andre-Pierre Gignac, who plays his club football in Liga MX, got France's consolation with a second-half penalty.

Burnley striker Chris Wood scored as New Zealand earned a 1-0 win over South Korea, and Milan midfielder Franck Kessie netted in Ivory Coast's 2-1 victory against Saudi Arabia.

Spain were held 0-0 by Egypt, while hosts Japan edged South Africa 1-0 and Romania beat Honduras by the same scoreline.

France head coach Sylvain Ripoll has called on his players to "digest" their 4-1 thumping by Mexico and promptly step up their game at Tokyo 2020.

Les Bleus went into the Olympic tournament rated as being among the leading medal contenders along with Brazil and Spain.

But they suffered a miserable defeat to Mexico on Thursday and are now under pressure in Group A with just three days until their next match against South Africa.

The match was goalless at half-time, with five goals scored in an extraordinary second period.

But France only accounted for one of those strikes, a penalty from captain Andre-Pierre Gignac.

"The first thing we are going to do is digest what happened," said Ripoll. "We only have a couple of days between matches so it's not very much time. 

"Of course we knew this would be difficult but we know we can do better. There's not a lot of time [between matches] so each player will have to focus on themselves individually.

"We play as a team but everybody needs to step up their game so we can get a better result in the game against South Africa."

Ripoll felt France's struggles to keep the ball were key to their defeat, but does now feel Mexico will be looked at in a different light.

"We are disappointed, not just with the result but with the content of the match," he added.

"We should have had a better balance, we needed to be better, but now we can really understand the quality of the Mexico team, which is a really high-quality team.

"There's more that we should have done. It's important to understand that we need to improve our game going forward. 

"In football it's all about having the ball and we struggled with that."

Hosts Japan, who beat South Africa 1-0 in their opener, are the other team in Group A.

Spain boss Luis de la Fuente was dismayed to lose Oscar Mingueza and Dani Ceballos to injuries in the team's Tokyo 2020 opener.

The head coach of the Olympic team fears Barcelona defender Mingueza and Real Madrid midfielder Ceballos will not make swift recoveries.

He was also critical of the officiating that allowed Egypt to enforce their physical game on the match that finished 0-0 in Sapporo.

Speaking about the injured duo, who were both forced off in the first half, De la Fuente said: "They are the greatest concern. They do not look good. Let's see if I'm wrong and they can recover.

"We are very concerned because they could be serious injuries."

Mingueza was on the receiving end of a sixth-minute heavy tackle that saw Ahmed Fotouh yellow-carded, and then came off in the 22nd minute.

Ceballos was replaced shortly before half-time after being fouled by Taher Mohamed, although it was seemingly unintentional when the Egyptian player stood on the Spain star's left ankle.

Asked about Egypt's approach, after they were shown four yellow cards, De la Fuente suggested they should have had more discouragement from such forceful tackling.

He said, quoted in Marca: "The other day we had a talk in which they explained to us how the VAR works and we hope that next time we will have better luck with the sanctions that take place in the field of play because today we have not had it.

"We had a meeting that explained the actions that could be punished with a red card. Today there were several of them and they were not punished as they told us."

Mingueza had a breakthrough season at Barcelona last term, playing 39 senior games after stepping up from the club's B team.

Ceballos has returned to Real Madrid ahead of the new LaLiga campaign after spending the past two campaigns on loan at Arsenal. He failed to score in 40 games for the Gunners last season and had just three assists.